Jonathan Todd Schwartz was on trial for wire fraud and tax crimes, accused of stealing about $4.8 million from Morissette alone, in addition to funds from pro athletes and other clients.
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Authorities said Schwartz had admitted withdrawing money belonging to Morissette between 2010 and 2014 for himself without her knowledge.
He had blamed his crimes on a gambling addiction, but prosecutors said the funds financed a lavish lifestyle.
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Morissette says Schwartz stole her trust along with her money and had his embezzlement continued, she would have gone bankrupt.
Morissette says her ex-manager stole in "a long, systematic, drawn-out and sinister manner."
The Associated Press contributed to this report.